Sprag-sharpener.



N0 895381 n PATBNTED-AUG.4, 19o8.-

J. MGDONALD.

VSPR-XG SHARPHNER.A j APPLICATION FILED un.. 1. 190s. 1.x :1g

ers, of which the following is a specication.

JOHN MCDOXALD, F SILVER (jl I sPRAGfsHARPEiIB T o all lwhom it mayconcern?.

Be it known that LJOHN HcDoxALo, a citizen of the. United States,residua;Y at Silver Creek, in the county of Schuyikill and Sta-te ofPennsylvania, have invented ,new and useful lmproveni'ents inSpreg-Sharpem.

This-invention relates to a machine for forming and sharpening:r sprags,the object of the invention being to provide a simple construct-ion ofmachine by which 'logs or billets of wood may be sawed into sprags orstakes of a desired length, and the drivingends of the sprags or stakesso formed readily and expe( itiously pointed or sharpened.

A further object of the invention is to provide a machine of thischaracter in which the billet cutting)r saw and sp1-agr sharpeningcutter head may be mounted upon the saine shaft through a novelconstruction andar-V rangement. of the. parts of the machine, thusena-bling,r both to be drivenfrom iin-,saine source of power withoutcomplication of parts; and also toprovide novel ineens for feeding thespreer to the cut-ter head and retracting the feeding device.

With these and other objects in view, the invention consists of thefeatures of construction, combiin'ition and arrangement of partshereinafter fully described and claimed,

reference being had to the accompanymg drawing, in which Figure 1 is avertical transverse section through a wood-working machine embodyingvlnyinvention. Fig. 2 is a longitudinal sect-ion on the line 2-2 of Fig. 1.VFie'. 3 is .V a transverse section'on line 3--3 of Fie'. 1.

. overhang the extension 3.' Upon t` Fig. 4 is a transverse sectionthrough the cutter head.

i Referring now more particularly to the drawings, the numeral 1designates a suitable frame, supporting a. work table 2, fria-n one sideof which frame projects a horizontal extension 3 arranged b elow thelevel o *he table 2 and supported at its outer end npon a 4e bars 3 andan outer cross-bar 3*and being con-A nected and braced from the ad'acentside of the frame 1l bv a brace rod or ar 5.

stand 4, said extension 3 comprising sul A-main shaft or arbor Gisjournaled in suit.-

able bearings and extends transversely the frame, with its outer endemerged to end of said shaft is mounted a cil-casu: saw 8 arranged toproject above the' sur's of the table 2 through a slot 9. This sai- 1sde- Speccaon of Letters P tent.

l Applcatien March 7, 1908. Serial\N`o. 419,753.

e inner PENNS YLVA NIA.

Patented ug. 4, 1908.

j signed to beused for cuttinglogs or blllets of wood into suitable.lengt-h to forni spi'ags or stakes, such logs or billets beingr restedupon the table 2 and fed up to the saw. A pu ley is provided upon theshaft for connection with a belt leadmfgxfrom a suitable source ofpower, by which the shaft driven. "1

Arranged upon the outer end of the shaft 6 is a cutter head 1], `whichis in the form of a posed, and provided with a series of longitudinalslots '12 extending from its apex to'n point near its base, the latterbeing formed with a tubular guide extension 13 whereby .i the end of thesprag or stake wl ich is being fed up maj,l be accurately `forced intothe cone.

' Through the slots l2 project cutting knives 14, whose inner cuttingedges extend into the cone, and which are curved to rest nga-instlongitudinal ribs or bosses 15 formed on the exterior of the cone.7which ribs or bosses are provided with curved supporting faces extendingtangentially to the respective slots, by which thecutting blades orknives are disposed for effective operation on the end of the sprag totrim the same rapidly and cleanly to a point, the sha-vings dischargingthrough the slots, as willbe readily understood. Y Arranged below and inthe' vertical plane of the shaft 6 is a shaft, or arbor 16 joumaledv atits inner end to rot-ateand tilt vertically in a bearinr 17 arrangedbelow the bearing 7. and journnled at its outer end in a slot or openbearing 1S in the outer wall or cross ba'r of the frame extension Theinner end of said shaft carries a friction wheel 19 in engagement with afriction drum 20 on the hollow cone, having` its buse outwardly disshaft6, by which motion will be transmitted from said shaft 6 'to the shaft16.

The side bars 3, of the frame extension 3 recessed to receive. saidribs, and Whose upper face is formed with a recess 24to receive thestake or sprag 25, and thus serve the function of a clamping jew.Through the carriage on opposite sides of the line of the recess 24extend guide bolts or rods Z6 which project upwardly above the same andare connected by a head or cross piece 27 carry'- ing a stationary nut128 through which passes a coiperating screw sha-ft 29 connected at itslower end with a, clamping block or member 30 and provided at its upperend with a i l r 2 Y Y' A895,287

movable in saidslo, Whose bottom well 25D,

1. forimdwith threads to engage said shaft, whereby, when the shaft isin engegenlent with 'such threads, the carriage will be fed forward ortoWu-rdsthe eutterhead. A lever 26 is fulcrunied on the cross bnr 3" andprovided with au rve 127 loosely encompassing the slm-ft, whereby thelatter may be tilted vertically to move it int-o and out of engage` mentwith the threaded wall 2'5", and coiled contractile s rings 28", one oneach side of the line of t ie shaft, are provided to retract or returnthe carriage to normal position when the shaft 'is disengaged from wall25", said springs being termina ly connected with the carriage and bar3l.

In operation, it will be understood that the billets of wood are .sewedinto vsuitable lengths to form the stakes by the circuler saw 8,. andthe stakes then moved to a suitably convenient position to hesuccessively applied to the carriage and pointed or sharpened at one endby the rotary cutter heed 11. In the operation of sharpening, the stakeis clamped in position between the carriage end block 30; as shown indotted lines in Fig. 1, and the carriage is then fed forward b throwingthe shaft 16 into engaveinent wit 1 the threaded well 25, so that theinner end of the stake will enter the conical cutter hea-d 11 and betrimmed to a tapered point by the cutting knives 14. 1When the end ofthe sprag is fully sharpened, the 'operator tilts the outer end of theshaft 16 upward in slot 2.5a and the springs return the carriage tonormal position. The successive operations of separating billets of Woodinto suitablelengths and sharpening the driving ends of the spragsorstakes thus formed may in this manner be easily und quicklyaccomplished.

Having thus fully described the invention, what is claimed as new is A Amachine of the character described com-4 prising a, freine having atable and a lateral extension forming a. guideway below the plane of thetable, a shaft journaled u on the frame and hnviiu7 one end disposed beow the table end the ot 1er end disposed above' said guidewity, seidtable being provided With a slot, e circular sew upon the first-nemedend of the shaft' projecting through sind 'slot above the surface of thetable, e pointing cuti ting heed upon the opposite ein of the shaftlying above the said guideway, a eerriave arranged to trevcise seidguideway toward and from seid pointing cutter', said carriage having aslot termed with n, threaded portion, a. tilting shaft extending throughseid slot, means for adusting the slurf t to throw it into and out ofengagement with said threaded portion, and ineens 'for' automaticallyretrnlcting the carriage when seid shaft is thrown out of enga-gementwith seid threaded portion.

In testimony whereof I affix my signature in presence of two Witnesses.

P. J. MARTIN, J. LINEAWEAVER. Y

